Method of making a package, comprising an outer carton blank with alining and provided with means preventing wedging

ABSTRACT

A method for providing projections at the edge of traylike packages to prevent wedging when nesting or stacking a plurality of packages. The projections are made by flaps formed by slots at the upper edge of the carton, which flaps are depressed outwardly when a plastic foil is deep-drawn into the package.

a llmted States Patent 1151 3,640,188

Dilot Feb. 8, 11972 [54] METHOD OF MAKING A PACKAGE, [56] References Cited COMPRISING AN OUTER CARTON UNITED STATES PATENTS BLANK WITH ALINING AND 3,547,722 12/1970 Andersson 93/3601 x PROVIDED WITH MEANS 2,292,403 8/1942 P6166. ..93/36 PREVENTING WEDGING 3,533,135 l0/l970 Christensson..... 93/3601 X 3,097,574 7/1963 Kuchenbecker.. 93/366 X [721 Invent Magm's Swede" 3,338,020 8/1967 McGee 93/36.0l x [73] Assignee: AB Akerlund & Rausing, Lund, Sweden 33661019 I/ McGee "93/3601 3,372,830 3/1968 Edwards ..93/93 221 Filed: Nov. 5, 1970 3,389,644 6/1968 Williams. 93/366 x 3,430,410 3/1969 Heislflt ..93/93 [21] APPI- 3,460,442 8/1969 Williams. ....93/36.6 x [30 1 Foreign Application Priority Dam 2,467,930 4/1949 Coyle ..93/39.1 P

FOREIGN PATENTS OR APPLICATIONS Oct. 3, 1968 Sweden ..l3337/68 1,340,486 9/1963 France ..93/3601 Related US. Application Data Primary Examiner-Wayne A. Morse, Jr. [62] Division of S61. NO. 854,575, Sept. 2, 1969, Pat. N6. Scheme Parker 3,575,338. 57 ABSTRACT 52 us. (:1. ..93/36.01,93/36 M,93/36 MM, A method for Providing P i akthe edge f "aylike 93/39 P paekages to prevent wedging \a hen nestmg or stackmg a plu- 511 161. c1. ..11311149/02, B3lb 5/14, B3lb 1/62 Packages- The Pmlecmns are made byflaps [58] Field ofSearch ..93/8 WA 36 MM 36.01 36.6 by the edge the camn' wh'ch flaps 93/93 HT, 36 M, 39.] P

depressed outwardly when a plastic foil is deep-drawn into the package.

2 Claims, 2 Drawing Figures PATENTEU FEB 8 I972 JNVENToR Rolf Magnum Di/ot METHOD OF MAKING A PACKAGE, COMPRISING AN OUTER CARTON BLANK WITH ALINING AND PROVIDED WITH MEANS PREVENTING WEDGING ing disposed therein, which has been deep-drawn into the car-- ton blank after the said carton blank has been disposed in a mold in an erected condition, the method further comprising forming means to prevent wedging of packages nested or piled one in another.

Packages of the above-mentioned kind are often delivered to the consumer piled in each other. In order to make it easy to separate them in connection with the filling of the packages, these ought to be provided with means to prevent them from wedging into each other. The present invention aims at improving such means. According to the invention the means consists of an extension of the lining which is made by slotting the carton blank and then squeezing it outwardly at one or several places about its upper edge. a

By the invention you can derive a very secure construction, which effectively prevents wedging. By the construction according to the invention one or several plastic bubbles are formed along the upper edge of the package. These plastic bubbles serve as abutments when packages are piled one in another. However, due to the fact that the bubbles are made by a slitting of the carton blank, flaps of the carton blank provide an effective protection to the bubbles. The invention is described in greater detail in the following with reference to the accompanying drawings.

FIG. 1 shows the carton blank according to the invention in a flat condition.

P10. 2 shows a comer of the carton in an erected condition seen from the outside and diagonally from below.

As shown in FIG. 1 the carton blank comprises a bottom field 1, four sidewalls 2, 3, 4 and 5 and four comer fields 6. The corner fields 6 are at their outer free edges provided with slots 7, which at the innermost parts thereof are provided with transverse slots 8. The erection of the carton is made in such a way that after an initial prefolding, the carton blank is brought down into a mold, the dimensions of which essentially corresponding to those of the finished package. Over the mold and the blank placed therein a plastic foil of a deep-drawable quality is clamped. This plastic foil is heated and deep-drawn into the mold by means of pressure and/or vacuum. Preferably the carton blank and/or the lining have in advance been provided with a layer of a thermoplastic adhesive, which by the erection of the carton is disposed between these elements. At the time of the erection the thermoplastic layer is brought into contact with all surfaces of the carton blank so that the respective surfaces completely abut each other. Normally one can hereby use the heat provided for the deep-drawing for the activation of this adhesive. Should more heat be required, the carton blanks may be preheated By joining all abutting surfaces of the lining 10 and the carton blank, the flaps 9, defined by the slots 7 and 8, are effectively attached to the inner lining 10. Preferably this inner lining is provided with a border flange, which extends outwardly from the upper edge of the package beyond the bubble 11 so that the border flange masks or hides the bubble when viewed from above. in order to make an effective plastic bubble 11 at the comer of the package the actual mold is provided with a small cavity in front of the slots 7 and 8.

By the invention you do not only derive the benefit of an effective reinforcement of the plastic bubble 11 by means of the carton flaps 9 but also the possibility of the decoration projecting over the plastic bubble.

The invention is of course not restricted to the embodiment described above, but may be varied within the scope of the following claims. For instance you may vary the shape of the slots 7 and 8 in order to get another shape of the formed plastic bubble 1 1.

1 claim:

1. A method of making a nestable package comprising forming in a carton blank at least one first slot extending inwardly from the outer edge thereof, forming at least one second slot at the inner end of the first slot and extending at right angles thereto, said slots defining at least one or more L- shaped flaps, prefolding a traylike carton from said carton blank, placing the traylike carton in a mold, said mold having at least one cavity therein adjacent the at least one or more flaps, deep-drawing a heated plastic foil into the traylike carton to form a composite package having a plastic foil liner adhered to the inside thereof and to depress the at least one of said L-shaped flaps together with the adhered plastic foil liner outwardly into the at least one cavity to form at least one projection adjacent the upper edge of the package to prevent wedging of a plurality of nested packages.

2. A method as claimed in claim 1 wherein the plastic foil liner is adhered to the traylike carton by a thermoplastic adhesive which secures the foil to all inner surfaces of the traylike carton including one or more of the depressed L-shaped flaps. 

1. A method of making a nestable package comprising forming in a carton blank at least one first slot extending inwardly from the outer edge thereof, forming at least one second slot at the inner end of the first slot and extending at right angles thereto, said slots defining at least one or more L-shaped flaps, prefolding a traylike carton from said carton blank, placing the traylike carton in a mold, said mold having at least one cavity therein adjacent the at least one or more flaps, deep-drawing a heated plastic foil into the traylike carton to form a composite package having a plastic foil liner adhered to the inside thereof and to depress the at least one of said L-shaped flaps together with the adhered plastic foil liner outwardly into the at least one cavity to form at least one projection adjacent the upper edge of the package to prevent wedging of a plurality of nested packages.
 2. A method as claimed in claim 1 wherein the plastic foil liner is adhered to the traylike carton by a thermoplastic adhesive which secures the foil to all inner surfaces of the traylike carton including one or more of the depressed L-shaped flaps. 